Today, we’ve tried (with Michel Hubert) to use System Center Operation Manager 2007 R2 to monitoring my Azure Environment. We succeed to add a new azure application in SCOM but when We’ve tried to customize my management pack, a pop-up appears that prompted for the latest version of the Microsoft.SystemCenter.Library management pack and we were unable to retrieve this management pack on the SCOM Server.

After few research on the web, I found two link that help me to resolve the problem :

New management packs cannot be edited in the authoring console after the cumulative update is installed
When a new management pack is created after CU4 or CU5 is installed and then an attempt is made to edit the management pack in the Authoring console, the Authoring console cannot edit the management pack because it cannot find the latest version of the Microsoft.SystemCenter.Library management pack (build .61 for CU4 and build .81 for CU5).
To learn more about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base:

2590414 (http://support.microsoft.com/kb/2590414) You are prompted for the latest version of the Microsoft.SystemCenter.Library management pack when you try to edit a new management pack in Operations Manager 2007 R2 Manager 2007.

so you have to download the latest version of the MP , install it (the installer will extract the MP to a %Program Files% folder) and then you can point to this MP when the pop-up prompted.